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R30075 Cobalt vs. ASTM Grade HP Steel

R30075 cobalt belongs to the cobalt alloys classification, while ASTM grade HP steel belongs to the iron alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is ASTM grade HP steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
5.1
Fatigue Strength, MPa 250 to 840
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
78
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
490
Tensile Strength: Yield (Proof), MPa 480 to 840
260

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1360
1370
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
5.8
Embodied Energy, MJ/kg 110
82
Embodied Water, L/kg 530
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
21
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
170
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
25
Strength to Weight: Axial, points 26 to 42
17
Strength to Weight: Bending, points 22 to 31
17
Thermal Diffusivity, mm2/s 3.5
3.2
Thermal Shock Resistance, points 21 to 29
11

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.35 to 0.75
Chromium (Cr), % 27 to 30
24 to 28
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
29.2 to 42.7
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 0.5
33 to 37
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.5
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0